Questions tagged [power]

Power is the ability to supply a device with energy. This question covers how to power the Pi, ways to do it, and the safe ranges of power.

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CAN I boot RPI4 power up all 3.3V, 1.8V, 1.2V separately? and remove MxL7704

I am wondering If I can Run RPI4 or RPI CM4 by external 3.3V, 1.8V, 1.2V (x2) connected to board removing Mxl7704 and Chokes. and I may have to pull up RUN signal to RPI. located at MxL7704's 20th pin....
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LCD external power and touch over same USB interface

I have the following 7inch HDMI LCD display: As you can see it has an HDMI and a micro usb connector. So far for pure rendering I have connected HDMI to my R-PI and micro USB via an adapter to 5V/GND ...
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1answer
26 views

Programatically Establishing When RPi Supply Voltage is Too Low

Responses to this post: How does RPi "know" when it hasn't got enough power indicate that there is a digital input somewhere on the RPi which indicates what the supply voltage has ...
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GPIO input, keep high after button press

Hi was just wondering if there was a way of making a GPIO INPUT (connected to a momentary switch) stay high (for a certain amount of time), no matter how long the switch has been pressed for? The ...
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My Raspberry Pi 4 consumes only 0.3 A [closed]

I have a Raspberry Pi 4 that's is powered on the USB port by a circuit I made. The key component is a Buck Regulator (LM2576-5.0WT), the input is a AC adapter (12 V - 8 A). The regulator is able to ...
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2answers
551 views

Powering Raspberry Pi via battery pack and buck converter - how to solve low voltage reboot issues

I'm trying to power a Raspberry Pi 4 via a 6-AA battery pack via buck converter which steps it down to 5V but it gets stuck in a reboot loop on boot up. Watching the display on the buck converter, the ...
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Raspberry Pi 3 b+ not booting

I've raspberry Pi 3 b+ which is 2 years old since I purchased it. Recently it has started behaving very strangely. I've installed new rated power supply (5V 2A) for pi board. The board runs fines for ...
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37 views

Pi Zero with RS-485 interface operated inside breaker panel crashes

Setup I am operating an Raspberry Pi Zero inside a distribution board. The pi is powered via usb using a din rail power supply and it connected to an usb-rs485-adapter to get modbus data from a smart ...
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Physically turn the Raspberry Pi Touch display on and off with a switch

I use a Raspberry Pi Touch Display that I connect like shown in the following picture to my Raspberry. The black and red wires are connected to thee GND and 5v pins respectively. Now I want to ...
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1answer
69 views

Can RPi 4 deliver more amps on the 5 volt rail than RPi 3 powered over PoE?

I have a setup using a Raspberry Pi 3B. I use the PoE hat on top and I power the entire setup over PoE from a Unifi switch. The setup has quite a lot of peripherals that need power and I use the 5 ...
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Raspberry Pi 4 B GPIO boot and shutdown

I've been doing some research on power buttons for the Raspberry Pi, but I'm having quite a hard time finding information. Right now, I have button working on GPIO5, and when I connect it to the ...
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How do i properly daisy chain two motor drivers that both provide power to the Pi zero-w? [closed]

I am using two waveshare dual motor drivers to drive a total of 3 motors with room for another one. The HATs can be placed on top of each other as they have adjustable i2c addresses. I am planning on ...
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What's the simplest way to control a 12V battery power supply using a Pi Zero? [closed]

I'm short one garage door opener. The simple option would be to buy a new one, but where's the fun in that when you can massively overengineer a solution using AWS IOT? I'm intending to hook one ...
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1answer
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finding a 3.3V “micro-computer” to be used as a co-processor in some low power applications [closed]

I am working with some "low power" applications in which a 3.3V micro controller with some electronics around it logs some information for 20 minutes, and then the information needs to be ...
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Red Led flashing

I have a PI 4, WHEN using a 3.5A USB power measured 5.1v supply, the red LED is constantly on. When using a power supply which was rescued from a DVD player, checked supply 5.1v I get a flashing red ...
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Portable PSU for a rpi4 under high load

I need a small rechargeable setup for my rpi4b+ using lipo batteries. I've been looking for cheap methods instead of disassembling a power bank. I'm going to have some non-usb peripherals on the board,...
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Raspberry Pi 4B is not rebooting from SSH

I have a recently flashed SD card in my Raspberry Pi, I've just been through some setup and have found some errors with my SD card being in Read Only, I tried to reboot from SSH except the raspberry ...
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How should I power multiple RPi 3 units from a beefy power supply? [closed]

I have to power 20 Raspberry Pi 3 units from a few 5V 10A power DC power supplies. I have little experience in electronics. The RPis can be up to 1.5m apart from one another. A friend of mine ...
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Servo Controllers, Servos, Power consumption

I'm looking at options for controlling multiple Servos I keep finding the same board, the PCA9685 Which is great, I see people using them for those small 9g servos, but what about servos that pull ...
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Migrating From RPI 3A+ to CM3+ Lite

I'm migrating from the rpi-3a+ to a cm3+ lite because the product I'm making will be very small and the cm3+ is more for industrial purposes anyway. Ive decided for my case I will make a custom pcb ...
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346 views

Starting Pi 4 with global_en

It seems that those pins can be used to start Pi 4, but I am not sure exactly how. Can a Pi 4 start after having been shut down by the shutdown menu, if I connect the two holes like below for a short ...
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133 views

Can I power a Raspberry Pi Zero and use the data connectors on a MicroUSB header at the same time?

Curious to see if this is possible as I have two USB data connections I want to use simultaneously on the Pi.
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How to remove under voltage issue with Raspberry Pi 4

I have a project where I am using raspberry pi 4 and 5inch touchscreen. This screen is from waveshare but I have not enabled touch in it. I am using a USB splitter cable which on one end has usb male ...
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73 views

Mirabox Capture Card and External Power Source

I'm looking to power my Raspberry Pi 4B from a 12V tractor battery. I have a buck converter which can be found here. I am considering using this device to step-down the battery voltage and hook up the ...
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3answers
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Does Raspberry Pi 4 consume considerable amount of power in soft-off state?

In the Start menu (you know, the fruit button at the top-left corner), I clicked shutdown. I did not unplug the USB-C power cable. The red light was still on, but I thought it was like the sleep light ...
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2answers
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Raspberry Pi 3 Model B+ got hot even in idle

My Raspberry Pi 3B Plus is running Raspberry Pi OS (32-bit) Lite. I only made update, upgrade and install Apache2. It is connected to my home network with 1Gb Ethernet cable (no WiFi). Network traffic ...
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Connecting Pi to AVR with both I2C and ISP

So I'm attaching an ATTiny85 to a Pi Zero to build a variant of this WS2812 LED driver. The Pi talks to the ATTiny via an I²C/TWI interface. However, I also want to be able to update the software on ...
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3answers
355 views

Argon One case doesn't power RaspberryPi

So I have just unwrapped and installed my new Argon One case that I bought from a retailer over the internet. Everything went smooth... except it doesn't work. It just doesn't start up. When I press ...
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1answer
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Not getting a full 3.3V instead getting like 0.7V on a GPIO pin

Okay so I ran the following code and I am seeing ~0.70V on the GPIO pin and not 3.3V. Why could that be? #import the GPIO and time package import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) ...
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35 views

Raspberry PI 3B+ will not reboot after removing power

Help! - I'm completely new to Raspberry. Today I have succesfully imaged the latest OS to the SD that came with my Raspberry PI 3 model B+. Everything works fine when I boot it up. I can also ...
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1answer
123 views

Schedule power off with systemd

I've enabled the following systemd unit file in order to properly shutdown my Raspberry Pi before a real timer in between cuts the power off. but it does a reboot, not the actual shutdown that I want. ...
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GPIO Power off on shutdown with retropie

i asked this question before but i have added a diagram to explain it more clearly. I am building a retropie arcade machine with a raspberry pi. I have added a shutdown / startup button to shutdown ...
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How to cut power to gpio pins on shutdown

I am working on a project where i am using a pi running retropie to make a homemade arcade machine. i have wired and coded a startup/shutdown button. i would like to set up the pi n such a way i can ...
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1answer
130 views

How can Rpi I2C read a Coulomb Counter, up to 18V, 10A?

I"m building an autonomous boat with a solar panel. The heart of the boat is a Raspi zero which contains a small program doing the navigation. I've got a 3S li-ion battery of which I'm already ...
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3answers
102 views

How can I prevent motor drivers back powering my Raspberry Pi

I have a Raspberry Pi 4B controlling an L298N module. I also have 2 cell batteries powering both. The cell batteries power the Pi through the 40 pin connector. The motor driver is powered by the cell ...
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1answer
142 views

How to connect Rpi4B to a HDMI Touch Screen?

I have recently invested in a HDMI touchscreen from Amazon, and a Raspberry Pi 4, For the touchscreen to work it must be connected via GPIO, however my pi cannot supply enough power to it from my usb ...
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1answer
42 views

Audible ground noise from ultrasonic sensor (VMA306)

I'm having problems with audible noise from a VMA306 sensor. Everything is working great apart from the audible low frequency buzz after my code is done running. The sound stops when touching any ...
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3answers
635 views

Constant undervoltage, despite meter showing otherwise

I have a Raspberry Pi 3B+, running Raspbian. Linux raspberrypi 4.19.97-v7+ #1294 SMP Thu Jan 30 13:15:58 GMT 2020 armv7l GNU/Linux It server primarily as a MagicMirror2 machine. I can see the ...
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475 views

How to deal with the error “device descriptor read/64, error -32”?

I'm using a Raspberry Pi 3 model B+ together with a Waveshare touch screen model 7inch HDMI LCD (C) which claims to be “low consumption,” although gives no precise amperage of the device. Anyway, ...
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2answers
400 views

overvoltage on POWER SUPLY; not on the gpio pins

I am feeding 5.41 V on the microUSB power supply pins to a raspberry Pi 3B. Yeah, I know, USB = 5V +/- 5%. Because reasons, I have to keep doing this for a while. What I find is that dmesg ...
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105 views

What power supply do I need to power three raspberry pi 3/4 and powered usb hub

I want to build a raspberry pi cluster with two RaspberryPi 4, one Raspberrypi 3 and a usb powered usb hub. in the past I used the MeanWell, RS-25-5 with 25W 5V 5A for just one Pi and usb hub. ...
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0answers
111 views

Pi-4b USB 3 no longer recognising Powered USB HDD Dock

TL:DR: Previously working setup now fails with no apparent hardware damage, nor deliberate software changes. My original setup had been working without problem since Sep 2019. I powered it down, ...
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1answer
60 views

Powering multiple Raspberry Pi 4s with 65W USB-C computer charger

Is it possible to power up multiple raspberry pi's with 65W USB-C computer charger? If so, is there anyone who have done it, that they can share how they did it?
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1answer
67 views

Power saving for raspberry pi2 model B

I have a raspberry pi 2 Model B and I want to disable the power to ethernet and USB hub port, I try using hub ctrl. c command, and it doesn't work. Is this happening because of the limitation of ...
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78 views

Unable to turn on/off my LG-1500 projector via HDMI-CEC

I am trying (and failing) to control the power state of my LG PF-1500 projector through HDMI-CEC. According to this forum thread it should be possible. LG calls its implementation SIMPLINK, which I ...
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0answers
42 views

Raspberry Pi Zero WH dead

I have problem with my Raspberry Pi Zero. When powering on with sd card inserted nothing happens, no LED is flashing. The os on the sd card is working on another raspberry pi. The problem occured ...
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1answer
56 views

powering a sensor usin external power

I' m not electronic or electricity specialist , i'm a developer who tries to make fun stuff on raspberry pi , and this is why i burned two rpi 3 . i'm using my rpi with many electronic stuff , pir ...
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1answer
87 views

Connecting DHT11 module kills raspberry

I have a DHT11 module that looks exactly like the image below. I also have raspberry pi zero wh. I have connected 3.3V (pin1) to the + on the module. GND (pin6) to the - on the module. I was carefull ...
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2answers
78 views

Powering using 5V rail fails

I have reviewed a lot about powering the PI using the 5V pins on the expansion connector but I have not seen the solution to this problem. Here are some of the tests I ran: (Setup: Nothing plugged in ...
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0answers
31 views

Low/Mid/High 230V Fan Control with RaspberryPI

I have fan 230 VAC 300 W, Relay SRD-05VDC-SL-C, and RaspberryPi, what other equipment i would need to be able to control Fan 230VAC with RaspberryPi? I want to go 0/1 with relay, and in mode:1, be ...

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